PRIMITIA. 19 



5. Primitia bovipeons, n. sp. Plate III, figs. 25 — 30. 



Description. — Valve suboblong, elongate, flattish. Dorsal margin straight and 

 equal to the length of the carapace. Ventral margin almost straight, oblique. 

 Ends unequally rounded. Anterior portion rather narrower than the posterior. 

 Valves with a broad, shallow central furrow, edged with two slight prominences, 

 extending perpendicularly from the dorsal margin halfway down, and having a 

 sharp elevated tubercle or horn standing out from the valve rather below the antero- 

 superior corner, and in the extreme postero-dorsal angle another horn which is 

 very lofty and tends upwards and backwards. Free margins bordered by a strong 

 impressed rim (fig. 28). Surface covered by a coarse, irregularly honeycomb reticu- 

 lation, with concave interspaces. 



Size. — A large specimen is 4'2 mm. long, and 2'3 mm. high. 



Localities. — In the Porter Collection is a slab containing four or five specimens 

 from Pilton ; and in my Collection are several specimens from the Pecten nexilis 

 bed of the Laticosta Cave, Baggy, one of which (fig. 27) has been squeezed into a 

 symmetrical shape. 



BemarJcs. — This fossil is referred to the genus Primitia by my friend 

 Professor Rupert Jones on account of its furrow, but he recognises that its central 

 tubercles, which in some specimens are strongly developed, show a passage 

 toward Ulrichia. 



It was first known to me by Mr. Porter's specimen, the locality of which was 

 indefinite, but I have since found it in plenty at Baggy Point together with other 

 Ostracods. 



6. PuiMiTiA VESTiTA, n. sp. Plate III, fig. 14. 



? 1892. Lepeeuitia mundtjla, JJlrich. Amer. Geologist, vol. x, p. 265, pi. ix, 



figs. 4—8. 



Description. — Valve elongate, subovate or bean-shaped, rather flat. Dorsal 

 border straight, nearly as long as the valve. End borders narrow, very 

 convex, angular above and passing insensibly below into the long convex ventral 

 border. Valve with a central oval node defined above and at the sides by an 

 impressed furrow, and with very indistinct and diffused lateral lobes. Ornament 

 of coarse elongated rugosities (not clearly shown in the figure) radiating from the 

 central node. Rim indistinct, oblique or bevelled. 



